Improvement in plungers for pressing glass



G. W. Plunger for WEYMAN.

Pressing Glass.

Patented July 16, I878.

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N.FEIERS, PHOTO- UYHOGRAFNER. WASHINGTON, D c.

UNITED STATES PATENT Dar en GEORGE WV. WEYMAN, OF PHILADELPHIA,PENNSYLVANIA.

IMPROVEMENT IN PLUNGERS FOR PRESSING GLASS.

Specification forming part of Letters Patent No. 206,157, dated July16,1879; application filed June 12, 1878.

To all whom it may concern:

Be it known that I, GEORGE W. WEY- MAN, of the city and county ofPhiladelphia, and State of Pennsylvania, have invented a new and usefulImprovement in Plungers for Pressing Glass, &c., which improvement isfully set forth in the following specification and accompanyingdrawings, in which- Figure l is a top or plan view of the plungerembodying my invention. Fi g. 2 is a central vertical section thereof.Fig. 3 is a sectional "iew of the cap detached.

Similar letters of reference indicate corresponding parts in the severalfigures.

My invention consists of a hollow plunger, having a cap which closes thetop of the same, and is provided with an inlet for cool water or air, anoutlet for steam or hot air, and a pipe communicating with the inlet andreaching into the plunger toward the bottom. within the chamber thereof,so as to prevent steam and hot air striking back into the inlet.

Referring to the drawings, A represents a hollow plunger, for pressingarticles of glassware and other substances, the same being properlymounted and operated. -l3 represents a screw-cap, which closes the upperend of the plunger, and is formed with channels or ways a a, which enterfrom the circumference of the cap. (3 0 represent pipes, which arefitted to the upper end of the plunger A, preferably at opposite points,and when the cap is in position the pipe 0 communicates with the channela, and the pipe 0' with the channel a. Suspended from the cap is a pipe,D, which projects into the space or chamber D of the plunger, toward thebottom thereof, so as to occupy only a portion of said chamber, and thecommunication of the pipe (l with the interior of the plunger is bymeans of the channel a, and said pipe D. The communication of theinterior of the plunger and pipe 0 is by means of the channel a.

Cool or fresh water is admitted into the plunger through the pipe 0, anddirected to the bottom thereof, where it flashes into steam, whichquickly fills the chamber D of the plunger, above the bottom of the tubeD, and is directed to the channel a, whence it escapes. As thedescending pipe D prevents direct communication of the steam with thechannel a, the steam is prevented striking back into the inlet 0,whereby the flow of cool or fresh water is not obstructed. As cool orfresh water is constantly admitted into the plunger, and it escapes assoon as converted into steam, the plunger, as it presses the hotmaterial, is kept comparatively cool, the advantages of which areappreciable by those familiar with the art.

The cap B closing the top of the plunger prevents the escape of steam orhot air thereat, and protects the workmen from scalding and burning. Asreciprocating motions are imparted to the plunger, the pipes C G will beflexible for at least a portion of their length, in order to properlymove with the plunger.

I am aware that it is not new to employ a hollow plunger which isoccupied by a screwplug having an inlet and outlet passage but in thesame there is no provision made for preventing the striking back of thesteam, as in my case; hence I believe that I have made an improvement inthe art.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The plunger A, with chamber D and inlet and outlet 0 C, in combinationwith the cap B, having channels a a, and the pipe D, sus pended from thecap and occupying a portion of the chamber 1), whereby the remainingportion receives the steam or hot air above the bottom of the tube,substantially as and for the purpose set forth.

GEORGE W. WEYMAN.

Witnesses:

H. E. GARSED, JOHN A. WIEDERsHEIM.

